# RF Wireless World

## Home of RF and Wireless Vendors and Resources

One Stop For Your RF and Wireless Need

## RF filter calculator-Lowpass calculator,Bandpass calculator

This page of converters and calculators section covers RF filter calculator. This page on RF filter calculator covers RF lowpass filter calculator and RF bandpass filter calculator.

### RF filter calculator-Lowpass filter type

Following is a simple LC based RF lowpass filter calculator of order N equal to 3.

Cutoff Frequency, MHz (input1) :

Characteristic Impedance, Ohm (input2) :

Inductance(L) in Henries (Output1):

Capacitance (C) in farads (Output2):

*Note: Enter values in INPUT boxes and Press CALCULATE button to check OUTPUTS.

Example of RF Filter Calculator of lowpass type:
INPUTS : Fc =1182.5 MHz, Z0 = 50 Ohm
OUTPUTS: L = 134 micro-henry, C = 5.38 pF

### RF lowpass filter calculator equation

Following are the equations used in RF lowpass filter calculator of order N equal to 3. Figure-1 depicts lowpass filter pi and T section topologies. This simple RF filter calculator made of L and C components is very useful.

### RF filter calculator-Bandpass filter type

Following is a simple LC based RF bandpass filter calculator of order N equal to 3.

BPF Start frequency, MHz (input1) :

BPF End frequency, MHz (input2) :

Characteristic Impedance, Ohm(input3) :

Inductance(L1) in Henries (Output1):

Inductance(L2) in Henries (Output2):

Capacitance(C1) in Farads (Output3):

Capacitance(C2) in Farads (Output4):

Example of RF Filter Calculator of bandpass type:
INPUTS : f1 = 1024.5 MHz, f2 = 1060.5 MHz, Z01 = 50 Ohm
OUTPUTS: L1 = 44 µH , L2 = 13.19 nH , C1 = 527.6 pF , C2 = 17.7 nF

### RF Bandpass filter calculator equation

Figure-2 depicts bandpass filter pi and T section topologies. Following are the equations for above mentioned RF bandpass filter topologies.

L1 = [ Z0/ (Pi*(f2-f1)) ] ..... Henries

L2 = [ Z0*(f2-f1) / (4*Pi*f2*f1) ] ..... Henries

C1 = [ (f2-f1) / (4*Pi*f2*f1*Z0) ] ..... Farads

C2 = [ 1 / (Pi*Z0*(f2-f1) ] ..... Farads

Refer step by step RF filter design. It covers microstrip based RF/Microwave Low Pass Filter design example along with Kudora's identities, Richard transformation and filter coefficients table for Chebysev LPF.
READ MORE➤

### Useful converters and calculators

Following is the list of useful converters and calculators.

dBm to Watt converter
Stripline Impedance calculator
Microstrip line impedance
Antenna G/T
Noise temp. to NF